INTERNAL COMBUSTION ENGINE CONTROL DEVICE

• Main Authors: MOTOFURU TAKESHI, JO YUSUKE, IDOGAWA MASANAO, MIZUTANI TAKAMITSU
• Format: Patent
• Language: English; Japanese
• Published: 20.05.2021
• Subjects: BLASTING; COMBUSTION ENGINES; CONTROLLING COMBUSTION ENGINES; ENGINE PLANTS IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNALCOMBUSTION ENGINES; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES ORENGINES IN GENERAL; HEATING; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS; LIGHTING; MACHINES OR ENGINES IN GENERAL; MECHANICAL ENGINEERING; STEAM ENGINES; WEAPONS

To provide an internal combustion engine control device which promptly restores purification performance of a catalyst after an internal combustion engine is returned from a fuel cut.SOLUTION: An internal combustion engine 10 comprises: a catalyst 18 installed in an exhaust passage 13; and a second air-fuel ratio sensor 20 which outputs a signal proportional to an oxygen concentration in gas passed through the catalyst 18. A control device 100 performs: rich control to set a target equivalence ratio making an air fuel ratio of an air fuel mixture richer than a theoretical air fuel ratio when an internal combustion engine is returned from a fuel cut; and target equivalence ratio setting processing to set the target equivalence ratio so as to increase the target equivalence ratio to be maintained while the rich control is performed with increase in an air excess ratio calculated from an output value of the second air fuel sensor 20 when the rich control is started.SELECTED DRAWING: Figure 1 【課題】燃料カットからの復帰後において早期に触媒の浄化性能が回復する内燃機関の制御装置を提供する。【解決手段】内燃機関１０は、排気通路１３に設けられた触媒１８と、触媒１８を通過したガスの酸素濃度に比例した信号を出力する第２空燃比センサ２０とを備える。制御装置１００は、燃料カットからの復帰時に混合気の空燃比が理論空燃比よりもリッチになるように目標当量比を設定して燃料噴射を行うリッチ制御を実行する。また、制御装置１００は、リッチ制御を開始するときの第２空燃比センサ２０の出力値から算出される空気過剰率が大きいほど、リッチ制御の実行中に保持する目標当量比が大きい値となるように目標当量比を設定する目標当量比設定処理を実行する。【選択図】図１